High-Voltage Circuit Breaker Gas Diversion
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Solution Overview
Problem
High-voltage circuit breakers face challenges in maintaining sufficient electrical separation between main contacts when the insulating gas density is low and the gas flow is not evenly distributed, leading to potential electrical separation failures.
Innovation Solution
A diverting device is implemented to evenly distribute the insulating gas flows towards the main contacts, ensuring that the insulating gas remains cold and compressed, thereby maintaining consistent insulation capacity and ensuring electrical separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the insulating gas density is reduced and the filled region is minimized, then the device complexity and gas quantity are reduced, but the insulating capacity between main contacts deteriorates
Solution Approach 1:
The circuit breaker is divided into distinct functional regions: an arc extinction region with the insulating nozzle containing hot insulating gas, and a main contact region with cold insulating gas. This segmentation allows each region to serve its specific purpose while maintaining overall insulation reliability with reduced total gas quantity.
Solution Approach 2:
Different thermal states are maintained in different locations: hot insulating gas is confined to the arc extinction region where it is needed for arc quenching, while cold insulating gas is maintained in the main contact region where electrical separation is critical. This local quality differentiation ensures insulation reliability without requiring high gas density throughout the entire device.
2Device complexity
If the insulating gas flows are not evenly distributed, then the gas flow structure is simplified, but the insulating capacity between main contacts deteriorates due to hot gas displacement
Solution Approach 1:
The diverting device introduces asymmetric flow control elements (such as deflectors or guide structures) that create a balanced symmetric flow pattern from asymmetric incoming flows. The diverting device may include asymmetric internal structures that redirect the hot insulating gas flows to converge symmetrically, ensuring uniform distribution in the main contact region without requiring complex external flow distribution systems.
3Productivity
If the insulating gas is heated by the electric arc, then the arc extinction capability is improved, but the insulating capacity between separated main contacts deteriorates
Solution Approach 1:
The hot insulating gas generated by arc heating is extracted from the arc region and directed away from the main contact region through the diverting device. This extraction prevents the hot gas from displacing the cold insulating gas between main contacts, allowing the heating process to continue serving arc extinction while protecting the insulation reliability in the main contact region.
Solution Approach 2:
The diverting device acts as an intermediary element between the hot arc region and the cold main contact region. It mediates the interaction between these two regions by controlling the flow of insulating gas, allowing the beneficial heating effect in the arc region while preventing the harmful thermal effect from reaching the main contact region.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures reliable electrical separation of main contacts by maintaining cold, compressed insulating gas between the contacts, even when the circuit breaker transitions to the switched-off position, thus preventing displacement and ensuring consistent insulation capacity.
Implementation Method 1
at least the insulating gas between the arcing contacts on the inside of the insulating nozzle is heated up. This insulating gas expands and, among other things, then generates the two insulating gas flows
Implementation Method 2
This insulating gas expands and, among other things, then generates the two insulating gas flows that are conducted on the outside of the insulating nozzle
Implementation Method 3
the insulating capacity achieved with the insulating gas between the two main contacts is always high enough, so that an electrical separation is constantly ensured
Data Source
AI summary
Described is a high-voltage circuit breaker provided with two opposite-arranged arcing contacts, which are surrounded by an insulating nozzle. Furthermore provided are two main contacts, arranged opposite each other outside of the insulating nozzle, with respectively one of these contacts being assigned to one of the two arcing contacts. The high-voltage circuit breaker is provided, in at least one embodiment, with at least one device for diverting an insulating gas flow from the region between the two arcing contacts, wherein a respective insulating gas flow is conducted outside of the insulating nozzle and in the direction toward the main contacts. A diverting device is provided, which is equipped with a mechanism for diverting insulating gas from the insulating gas flow that is diverted from the region between the two arcing contacts, such that the two insulating gas flows moving from both directions toward the main contacts have approximately the same effect on the insulating gas that is present in the region of the two main contacts, thereby ensuring that the insulating gas is not displaced significantly in this region.